build(deps): bump json_pure from 2.1.0 to 2.3.1

Bumps [json_pure](https://github.com/flori/json) from 2.1.0 to 2.3.1.
- [Release notes](https://github.com/flori/json/releases)
- [Changelog](https://github.com/flori/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v2.1.0...v2.3.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -247,7 +247,7 @@ GEM
     json-diff (0.4.1)
     json-schema (2.8.0)
       addressable (>= 2.4)
-    json_pure (2.1.0)
+    json_pure (2.3.1)
     jwt (2.2.1)
     kubeclient (4.5.0)
       http (>= 3.0, < 5.0)